Fig. 4From: The QseB/QseC two-component system contributes to virulence of Actinobacillus pleuropneumoniae by downregulating apf gene cluster transcriptionAcidic and osmotic stress resistance assays. WT S4074, ΔqseBC, ΔapfA, ΔapfB, ΔapfC and ΔapfD were treated with 0.02 M HCl (a) and 0.50 M KCl (b) or tryptic soy broth and incubated for 3 h at 37 °C. Then the bacterial survival rates were calculated. Data presented are the mean ± SD (N = 3). *P < 0.05Back to article page